High sensitivity snap shot CMOS image sensor

Details High sensitivity snap shot CMOS image sensor High sensitivity snap shot CMOS image sensor

2005-01-04

2005-01-04

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140DC, C250S226000

Reexamination Certificate

active

06838651

ABSTRACT:
The present invention is directed to a solid state imaging device comprising a red pixel, a blue pixel, a first green pixel, a second green pixel, two analog-to-digital converters and a color interpolation circuit. The first analog-to-digital converter converts the output of the red pixel and output of the blue pixel into digital signals. The second analog-to-digital converter converts the output of the first green pixel and output of the second green pixel into digital signals. The color interpolation circuit combines the digital signals to determine the color of the pixel.The solid state imaging device may further comprise a third analog-to-digital converter, a fourth analog-to-digital converter, a programmable clock generator and a control. The third analog-to-digital converter converts the output of the blue pixel into a digital signal and the fourth analog-to-digital converter converts the output of the second green pixel into a digital signal. The programmable clock generator has a first clock frequency and a second clock frequency, where the first clock frequency is slower than the second clock frequency. The control is coupled to the programmable clock generator, the third analog-to-digital converter and the fourth analog-to-digital converter. The control deactivates the third and fourth analog-to-digital converters if the programmable clock generator is at the first clock frequency, and the control activates the third and fourth analog-to-digital converters if the programmable clock generator is at the second clock frequency.

REFERENCES:
patent: 3971065 (1976-07-01), Bayer
patent: 5461425 (1995-10-01), Fowler et al.
patent: 6380880 (2002-04-01), Bidermann
patent: 6611289 (2003-08-01), Yu et al.

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